Dynamo-electric machine.



PATENTED MAR. 14, 1905.

H. G. REIST. DYNAMO ELECTRIC MACHINE.

APPLICATION FILED AUG. 1I 1904.

ITNESBESI [l ,74 if -No. 784,807. p Patented March 14, 1905.

L UNITED STATES PATENT OEEICE.

HENRY G. REIST, OF SCHENECTADY, NEY YORK, ASSIGNOR-TO GENERAL ELECTRICCOMPANY, A CORPORATION OF NET YORK.

I DYNANIO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. "784,807, dated March14, 1905.

Application led AugllSt l, 1904:. SCI'lLl N0. 218,988.

T u 'W7/bom i 77W?! 007100777# an armature or rotor otl aninduction-motor Beit known that I, HENRY Gr. R'EIsT, acitiarranged inaccordance with my invention, 50 zen of the United States, residing atSchenecand Fig. 2 shows the same in cross-section. tady, in the countyof Schenectady and State In the drawings, A represents the arma- 5 4oi:New York, have invented certain new and ture-spider, carrying thelaminations B. The useful Improvements in Dynamo-Electric MalaminationsB are provided with holes or slots chines, of which the following is aspeciiicato receive the conductors C. The laininations tion. are heldpressed together by the end plates E My invention relates to theconstruction of and bolts e, as is clearly shown in Fig. Q. iodynamo-electric machines, and refers particu- D represents the end ringsshort-circuiting larly to the armatures or rotors of alternattherotor-conductors. The end rings instead 1 ing-current motors. loli'being composed ot' a single solid ring are 60 It is well understood inthe art that an incomposed of a number ot' flat plates overlapduction-motor having a squirrel-cage rotorping to form a plurality offiat parallel rings 15 winding takes a large starting-current andseparated by small air-spaces. The rings are has a small startingtorque. 1n order to inshown held together by the rivets (Z and arecrease the starting torque and decrease the properly spaced from eachother by the strips starting-current, it is necessary to insert red',inserted edgewise between adjacent end sistance in the secondarycircuit. The inscrrings and having both ends bent over a conzo tion ofresistance, however, requires a coilductor and a rivet, respectively,which holds wound rotor with collector-rings or switching thespacing-strip securely in place. Theplates devices for cutting out theresistance when D may be made of sufficiently small cross-secthe motoris up to speed, since if the resisttion to heat rapidly at starting, andthereby tance were left in circuit the etciency at full to introduce anappreciable amount of resist- 25 speed would be materially reduced. anceinto the circuit of the armature. This My invention consists inprovidinga novel resistance serves to increase the startingarrangementforsquirrel-cage windings which torque; hut when the motor isup to speed the enables them to exhibit to a certain extent at airpassing radially outward between the starting the characteristics of acoil-wound plates reduces the temperature by such au 30 armature withresistance in circuit and at Vt'ull amount that the resistance falls, sothat the load to operate like an ordinary squirrel-cagearinature-conductors are practically short-cirarmature. Taccomplish thiswithout cmploycuited. The radially-arranged spacing-strips 8O ingcollector-rings or switchingdeviccs ot' any act like the vaues of ablower and produce a kind by means of a novel construction olshortstrong circulation ol air between the end 3 5 circuiting end ringsfor a squirrel-cage windplates. The division ol the end rings into a ingoit' such cross-section that they heat rapplurality of flat plates givesa large coolingidly at starting, so as to produce an apprccisurface,which renders it possible to reduce ableresistancc in thearmature-circuit, and so the temperature sutlicientlyat'tullspecd. Thearranged that they are ctlticiently cooled by resistance of theshort-circuiting rings may bc 40 the circulation of air produced by therotaadjusted by the slots f between adjacent coution ot the armature atfull speed, whereby ductors. These slots by cutting the straight theresistance is lowered by such an amount line joining adjacent conductorsprevent the that the rotor-winding-acts at t'ull speed like current from[lowing straight from one conan ordinary squirrel-cage. j d uctor toanother. By increasing the depth 45 My invention will best be understoodby of these slots the resistance of a ring of given reference to theaccompanying drawings, in cross-section may be increased. whichF l donot desire to limit myself to the par- Figure l shows an end view of aportion of ticular construction and arrangement of parts shown; but laim in the appended claims to Cover all modifications which are withinthe scope of my invention.

vWhat l Claim as new, and desire to secure by Letters Patent of theUnited States, is4

l. In an alternating-eurrent motor, a rotorbody, conductors carriedthereby, and a plurality of flat parallel rings separated by airspacesand short-eircuiting the ends of said conductors.

2. In an alternating-current motor, a rotorbody, conductors carriedthereby, and 'lat plates arranged to form a plurality of llat parallelrings separated by air-spaces and shorteireuiting the ends of saidConductors.

3. In an alternatng-eurrent motor, a rotorbody, conductors Carriedthereby, and a plurality of 'Hat parallel rings separated by airspaeesand short-circuiting the ends ol' said l free-,eea

Conductors, said rings being slotted. between adjacent conductors.

4c. ln an alternating-eurrent motor, a retorbody, conductors carriedthereby, and a [lat ring sliort-eireuiting the ends of said eonduetorsand slotted to cut the straight lines joining adjacent eomluetors.

In an alternating-current motor, a rotorbody, Conductors carriedthereby, a plurality of iiat parallel rings separated by air-spacesandsliort-eirouiting the ends ol said eonduetors, and radially-arrangedspacing-strips inserted between adjacent rings.

ln witness whereotl l have hereunto set my hand this 29th day of July,1,9045.

HENRY (L. HEIST. lVitnesses:

BENJAMIN B. HULL, HELEN Gramm).

